Corning 50mL clear polypropylene (PP) conical bottom centrifuge tubes have traditional polyethylene plug seal caps and are packed 25 per rack. Please check our Technical Information Listing for information on the physical and chemical properties of Corning plastic centrifuge tubes as well as important suggestions for safe use. Black printed graduations and a large white marking spot Maximum RCF is 15,500xg Sterile, certified nonpyrogenic and DNase-/RNase-free 95 k PA (14psi) pressure tested Product Description Qty./Pk.: 25 Qty./CS.: 500 Capacity: 50 mL Tube Style: Centrifuge Bottom Style: Conical Neck Style: Wide Top Style: Threaded Graduation Range: 5-50 mL Graduation Interval: 2.5 mL Color: Clear Cap Style: Plug Seal Cap Material: High Density Polyethylene Cap Diameter: 35.2 mm (approx) Cap Color: Orange Self-Standing: No Outer Diameter: 29.1 mm (approx) Length: 114.4 mm (approx) Feature: Disposable Rack: Yes